The first observation of the suppressed semileptonic B0s → K− μ+ ν_μ decay is reported. Using a data sample recorded in pp collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity of 2 fb^−1, the branching fraction B(B0s → K− μ+ ν_μ) is measured to be [1.06 ± 0.05 (stat) ± 0.08 (syst)] × 10^−4, where the first uncertainty is statistical and the second one represents the combined systematic uncertainties. The decay B0s → Ds− μ+ ν_μ , where Ds− is reconstructed in the final state K+ K− π−, is used as a normalization channel to minimize the experimental systematic uncertainty. Theoretical calculations on the form factors of the B0s → K− and B0s → Ds− transitions are employed to determine the ratio of the Cabibbo-Kobayashi-Maskawa matrix elements |Vub|/|Vcb| at low and high B0s → K− momentum transfer.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). First Observation of the Decay B0s → K− μ+ ν_μ and a Measurement of |Vub|/|Vcb|. PHYSICAL REVIEW LETTERS, 126(8), 1-11 [10.1103/PhysRevLett.126.081804].

First Observation of the Decay B0s → K− μ+ ν_μ and a Measurement of |Vub|/|Vcb|

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Zucchelli, S.;
2021

Abstract

The first observation of the suppressed semileptonic B0s → K− μ+ ν_μ decay is reported. Using a data sample recorded in pp collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity of 2 fb^−1, the branching fraction B(B0s → K− μ+ ν_μ) is measured to be [1.06 ± 0.05 (stat) ± 0.08 (syst)] × 10^−4, where the first uncertainty is statistical and the second one represents the combined systematic uncertainties. The decay B0s → Ds− μ+ ν_μ , where Ds− is reconstructed in the final state K+ K− π−, is used as a normalization channel to minimize the experimental systematic uncertainty. Theoretical calculations on the form factors of the B0s → K− and B0s → Ds− transitions are employed to determine the ratio of the Cabibbo-Kobayashi-Maskawa matrix elements |Vub|/|Vcb| at low and high B0s → K− momentum transfer.
2021
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). First Observation of the Decay B0s → K− μ+ ν_μ and a Measurement of |Vub|/|Vcb|. PHYSICAL REVIEW LETTERS, 126(8), 1-11 [10.1103/PhysRevLett.126.081804].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/848622
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